Copper cast and casting parts from foundry: Recent Episodes
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Centrifugal cast copper In the production process, the determination of the rotational speed of the mold is very important, which directly affects the quality of the casting and the cost of production. If the rotation speed is too low and the centrifugal force is insufficient, it will easily lead to poor filling of the castings. Raining will occur in horizontal centrifugal casting. However, if the rotation speed is too high, not only will resources be wasted, but also longitudinal cracks and segregation of components will occur.
High-lead bronze high-lead bronze has high fatigue strength, thermal conductivity and wear resistance, and excellent quality such as cracks under working conditions with impact load. High-lead bronze sleeves are commonly used in large-scale crushing equipment with high load and high speed. However, the melting point and specific gravity of copper and lead in high-lead bronze are very different, and regional segregation of lead is likely to occur during the casting process, so casting is difficult.
Bronze is a non-ferrous metal alloy with a small casting shrinkage and is used to produce castings with complex shapes, clear outlines and low air tightness requirements. Tin bronze is very resistant to corrosion in the atmosphere, sea water, fresh water and steam, and is widely used in steam boilers and marine parts. Phosphorus-containing tin bronze has good mechanical properties and can be used as wear parts and elastic parts of the working machine. Lead-containing tin bronze is often used as a wear part and a plain bearing.
Tin bronze has good casting performance, anti-friction performance and good mechanical properties, and is suitable for manufacturing bearings, worm gears, gears, etc. Lead bronze is a widely used bearing material for modern engines and grinding machines. Aluminum bronze has high strength, good wear resistance and corrosion resistance, and is used for casting high-load gears, bushings, marine propellers, etc.
The main shaft is supported by ball bearings, the circulating oil is forcibly lubricated and cooled, and is equipped with a temperature sensor;
The feed port is equipped with a powerful double-cylinder feeding device. The position is high and low, and rotates in the same direction. The large loose material can be gradually flattened and sent into the machine. The rotation speed of the drum determines the feed speed. It is controlled by the load current feedback of the main motor to achieve automatic adjustment to ensure that the main engine is under load.
Brass is a copper alloy with zinc as the main additive element. It has a beautiful yellow color and is collectively called brass. The copper-zinc binary alloy is called ordinary brass or simple brass. Brass with more than three yuan is called special brass or complex brass. Brass alloys containing less than 36% zinc are composed of solid solution and have good cold workability. For example, brass containing 30% zinc is commonly used to make bullet casings, commonly known as cartridge brass or seven-three brass. Brass alloys containing between 36 and 42% zinc are composed of solid solution, the most common of which is 40% brass with 40% zinc. In order to improve the performance of ordinary brass, other elements such as aluminum, nickel, manganese, tin, silicon, lead, etc. are often added. Aluminum can improve the strength, hardness and corrosion resistance of brass, but it reduces the plasticity and is suitable for seawater condensing pipes and other corrosion resistant parts. Tin can improve the strength of brass and its resistance to seawater. It is called naval brass and is used as a ship thermal equipment and propeller. Lead can improve the cutting performance of brass; this free-cutting brass is often used as a watch part. Brass castings are commonly used to make valves and pipe fittings.
Bronze originally refers to copper-tin alloy. The copper alloys other than brass and white copper are called bronze, and often the name of the first major additive element in front of the bronze name. Bronze casting and copper casting is often seen.Tin bronze has good casting properties, good friction reducing performance and good mechanical properties, and is suitable for manufacturing bearings, worm gears and the like. Lead bronze is a widely used bearing material for modern engines and grinding machines. Aluminum bronze has high strength, good wear resistance and corrosion resistance, and is used for casting high-load gears, bushings, marine propellers, etc. Beryllium bronze and phosphor bronze have high elastic limit and good electrical conductivity, and are suitable for manufacturing precision springs and electrical contact components. Beryllium bronze is also used to manufacture non-sparking tools for use in coal mines and oil depots.
Copper alloy is a copper alloy with nickel as the main additive element. The copper-nickel binary alloy is called ordinary white copper; the white copper alloy with elements such as manganese, iron, zinc and aluminum is called complex white copper. Industrial white copper is divided into two types: structural white copper and electrical white copper. Structural white copper is characterized by good mechanical properties and corrosion resistance, and beautiful color. This white copper is widely used in the manufacture of precision machinery, chemical machinery and marine components. Electrician white
Copper generally has good thermoelectric properties. Manganin, copper, and copper are manganese white copper with different manganese content. They are used in the manufacture of precision electrical instruments, varistor, precision resistors, strain gauges, thermocouples, etc.
Copper is named for its purple-red color. It is not necessarily pure copper, and sometimes a small amount of deoxidizing elements or other elements are added to improve the material and properties, so it is also classified as a copper alloy. Chinese copper processing materials can be divided into: ordinary copper (T1, T2, T3, T4), oxygen-free copper (TU1, TU2 and high purity, vacuum oxygen-free copper), deoxidized copper (TUPTUMn), adding a small amount of alloying elements. Special copper (arsenic copper, beryllium copper, silver copper) four categories. The conductivity and thermal conductivity of copper are second only to silver and are widely used in the production of conductive and heat-conductive equipment. Copper is used in the chemical industry for its good corrosion resistance in the atmosphere, seawater and certain non-oxidizing acids (hydrochloric acid, dilute sulfuric acid), alkalis, salt solutions and various organic acids (acetic acid, citric acid). In addition, copper has good weldability and can be processed into various semi-finished products and finished products through cold and thermoplastic processing. In the 1970s, the output of copper exceeded the total output of other types of copper alloys.